The greatest grand challenge for any scientist is discovering how to prevent the spread of HIV and finding the cure or an effective vaccine for AIDS.

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• Francis Of Assisi

  Saint

  Thursday, Jun 24, 1182
  Saturday, Oct 03, 1226

• Nelson Mandela

  Former President Of South Africa

  Thursday, Jul 18, 1918
  Thursday, Dec 05, 2013

• Joe Biden

  Vice President Of The United States

  Friday, Nov 20, 1942
  

• Leonardo Da Vinci

  Painter

  Thursday, Apr 15, 1452
  Friday, May 02, 1519

• Marcus Aurelius

  Roman Emperor

  Saturday, Apr 26, 0121
  Friday, Mar 17, 0180

• Napoleon Bonaparte

  Military Commander

  Tuesday, Aug 15, 1769
  Saturday, May 05, 1821

• Ernest Hemingway

  Author

  Friday, Jul 21, 1899
  Sunday, Jul 02, 1961

• Oscar Wilde

  Writer

  Monday, Oct 16, 1854
  Friday, Nov 30, 1900

• Abraham Lincoln

  16Th U.S. President

  Sunday, Feb 12, 1809
  Saturday, Apr 15, 1865

• Steve Jobs

  Entrepreneur

  Thursday, Feb 24, 1955
  Wednesday, Oct 05, 2011

• Socrates

  Philosopher

  Thursday, Jan 01, 1970
  Thursday, Jan 01, 1970

• Ronald Reagan

  40Th US President

  Monday, Feb 06, 1911
  Saturday, Jun 05, 2004

• Will Rogers

  Actor

  Tuesday, Nov 04, 1879
  Thursday, Aug 15, 1935

• Dalai Lama

  Saturday, Jul 06, 1935
  

• John C. Maxwell

  Author

  Thursday, Feb 20, 1947